Solid line over a dashed line (direct current, DC)
On a rating plate: the equipment is suitable for direct current only. Next to a terminal or output: that terminal is for DC.
Symbol reference: IEC 60417-5031
A mark tells you what the maker declares, never that the product is safe.
- What it looks like
- A solid straight line with a dashed line (three short dashes) under it.
- Who may apply it
- The equipment maker, on the rating plate or terminals.
- Where it goes
- On rating plates and terminals.
What it does not promise
It gives no voltage, current or polarity. Match the output voltage, and check the polarity sign on barrel-plug supplies, before using a replacement power supply.
Other marks with the same shapes
Sources
Each page below was fetched and read on the date shown. Where a symbol’s IEC 60417 or ISO 7000 number is given, a public page listing that number is among them.
- Wikimedia Commons: File page transcribing IEC 60417 entry 5031 (title, function, publication) — Symbol 5031 from IEC 60417, “Direct current”: to indicate on the rating plate that the equipment is suitable for direct current only; to identify relevant terminals. Checked 2026-09-24.
Written in our own words; quotations are the sources’ wording.